The red spots in the rock are crystals of the rare halide mineral villiaumite ( NaF-sodium fluoride ).
2.
Serandite has been found in association with aegirine, analcime, arfvedsonite, astrophyllite, eudialyte, fluorite, leucophanite, mangan-neptunite, microcline, nepheline, sodalite, and villiaumite.
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